EP2328242A1

EP2328242A1 - Electrical connector

Info

Publication number: EP2328242A1
Application number: EP09814239A
Authority: EP
Inventors: Eiichi Sasaki; Takahiro Yoneda; Ryo Sawada
Original assignee: Tyco Electronics Japan GK
Current assignee: Tyco Electronics Japan GK
Priority date: 2008-09-19
Filing date: 2009-09-07
Publication date: 2011-06-01
Anticipated expiration: 2029-09-07
Also published as: US8118609B2; EP2328242A4; CN102160241B; KR20110061553A; US20110217864A1; JP4823284B2; EP2328242B1; KR101594199B1; JP2010073531A; CN102160241A; WO2010032393A1

Abstract

To provide an electrical connector that can provide stable contact between a signal transmission terminal and a short-circuit terminal even if the connector is downsized. A female connector 10 has a sub-housing 21 that has a plurality of terminal accommodating cavities 22 provided with a lance 23 by which a female terminal 11 is locked and a plurality of short-circuit terminal accommodating cavities 24 adjacent to the terminal accommodating cavities 22. A short-circuit terminal 12 has a bent part 14 at a forward position in a direction of mating with a mating electrical connector and a contact part 16 at a rearward position in the direction of mating. The sub-housing 21 has a window 25 that is formed at a position to the rear of the lances 23 corresponding to the contact parts 16 of the short-circuit terminals 12 and through which the terminal accommodating cavities 22 and the short-circuit terminal accommodating cavities 24 communicate with each other. The contact parts 16 of the short-circuit terminals 12 are in contact with the female terminals 11 through the window 25.

Description

Technical Field

The present invention relates to an electrical connector provided with a short-circuit terminal for keeping a short-circuit state of signal transmission terminals.

Background Art

An electrical connector (referred to simply as a connector hereinafter) for an air bag used in an automobile comprises a male connector and a female connector. Male terminals for signal transmission accommodated in the male connector are connected to a signaling side, such as a shock sensor, and female terminals for signal transmission accommodated in the female connector are connected to an apparatus side, such as an air bag unit. The connector has a function of short-circuiting the adjacent female terminals in order to prevent malfunction due to an accidental current flow to the apparatus side when the male connector and the female connector are separated from each other. The connector also has a function of breaking the short circuit between the female terminals in a state where the male connector and the female connector are mated with each other (Patent Document 1, for example).
As shown in FIGS. 10 and 11, a conventional female connector 100 in which adjacent female terminals 120 are short-circuited to each other comprises a housing 110 having a plurality of terminal accommodating cavities 111 (referred to simply as cavities 111 hereinafter) for accommodating female terminals 120 therein and the female terminals 120 accommodated in the respective cavities 111 and locked by respective lances 112. The female terminal 120 has a contact piece 120a formed by folding back a front end part of the female terminal 120 and a contact protrusion 120b protruding to the inside of the cavity 111. A male terminal of a male connector (not shown) is electrically connected to the female terminal 120 at the upper surface in contact with the contact piece 120a and the lower surface in contact with the contact protrusion 120b. The housing 110 has, at the front thereof, male terminal inlets 113 formed at positions corresponding to the positions of the cavities 111. In this specification, a side of the female connector at which the mating connector (male connector) is mated therewith is defined as a front side, and the opposite side is defined as a rear side.
The female connector 100 has a U-shaped short-circuit terminal for short-circuiting a pair of female terminals 120 that are adjacent to each other in the width direction. As shown in FIG. 5 of Patent Document 1, the conventional short-circuit terminal has a bent part formed at the rear thereof and a contact part formed at the front thereof that is to come into direct contact with a female terminal, and the section from the bent part to the contact part functions as a spring. The contact part comes into elastic contact with the lower surface of the contact protrusion 120b of the female terminal 120 through a window 114 formed in a front part of the housing. Then, as shown by the arrow A in FIG. 10, an upward force is applied to the female terminal 120.

Citation List

Patent Document

Patent Document 1: Japanese Patent Laid-Open No. 9-50850

Summary of Invention

Problems to be Solved by the Invention

For the conventional female connector 100, the lances 112 are disposed above the female terminals 120 to which an upward force is applied. However, the lances 112 are elastically deformable and therefore cannot adequately absorb the upward force. As a result, the female terminals 120 are deformed to be bent upward, and the contact between the contact parts and the female terminals 120 is unstable. Thus, there is a possibility that the short circuit between the paired female terminals 120 is broken, and a current accidentally flows to the apparatus side to cause malfunction.
If a housing wall that supports the female terminals 120 is formed at the front of the lances 112, the upward displacement of the female terminals 120 can be prevented. Actually, however, a mold member for forming the lances 112 has to be placed at the front of the lances 112, and therefore the housing wall cannot be formed at the front of the lances 112.
In addition, as a component of an automobile, there is a demand for downsizing of the female connector 100. To meet the demand, the lance 112, which is a component of the female connector 100, also has to be reduced in size. However, if the size of the lance 112 is reduced, the strength of the lance 112 decreases, and the female terminal 120 is more easily deformed and bent upward.
In addition, for the conventional female connector 100, the window 114 is formed over a front end part of the terminal accommodating cavities 111. Thus, as shown in FIG. 11, the female terminal 120 is held by the housing 110 only at the opposite side surfaces in the width direction. As a result, the female terminal 120 is likely to rotate about the axis thereof and be displaced. As the displacement becomes significant, the female terminals 120 become unable to be smoothly mated with the male terminals.
The present invention has been devised in view of such technical problems, and an object of the present invention is to provide a connector that can provide stable contact between a signal transmission terminal and a short-circuit terminal and prevent rotation of the signal transmission terminal about an axis thereof even if the connector is downsized.

Solution to Problem

To achieve the object described above, a connector according to the present invention comprises: a housing that has a plurality of terminal accommodating cavities provided with flexible lances by which signal transmission terminals are locked and a plurality of short-circuit terminal accommodating cavities adjacent to the terminal accommodating cavities; signal transmission terminals accommodated in the terminal accommodating cavities; and U-shaped short-circuit terminals accommodated in the short-circuit terminal accommodating cavities, the short-circuit terminal has a bent part at a forward position in a direction of mating with a mating electrical connector and a contact part at a rearward position in the direction of mating, the housing has a window that is formed at a position to the rear of the lances corresponding to the contact part of the short-circuit terminal and through which the terminal accommodating cavities and the short-circuit terminal accommodating cavities communicate with each other and an upper supporting wall for the signal transmission terminals formed at a position to the rear of the lances corresponding to the contact part of the short-circuit terminal, and the contact part of the short-circuit terminal is in contact with the signal transmission terminals through the window.
Preferably, the connector according to the present invention further comprises a secondary locking member that locks the signal transmission terminals in addition to the lances serving as a primary locking member, the secondary locking member is inserted into the housing in a width direction of the housing, and the secondary locking member locks the signal transmission terminal at a position to the rear of the short-circuit terminal. As the size of the connector decreases, it is more difficult to hold the signal transmission terminals only with the lances. Thus, the secondary locking member that locks the signal transmission terminals is provided in addition to the lances serving as a primary locking member, thereby preventing the signal transmission terminal from falling off the downsized connector.

Advantageous Effects of Invention

The housing of the connector according to the present invention has a window that is formed at a position to the rear of the lances and through which the terminal accommodating cavities and the short-circuit terminal accommodating cavity communicate with each other. In addition, an upper supporting wall that defines the terminal accommodating cavities is formed at a position to the rear of the lances. The wall has a sufficiently higher rigidity than the lances. Therefore, for the connector according to the present invention, when an upward force is applied to the signal transmission terminals, the upper supporting wall receives the upward force, so that the signal transmission terminals are less likely to be deformed and bent upward.
In addition, for the connector according to the present invention, since the window is formed at a position to the rear of the lances, a lower supporting wall capable of supporting the signal transmission terminals from below can be formed over a front end part of the terminal accommodating cavities. As a result, at the front end part of the terminal accommodating cavities, the signal transmission terminals are supported not only at the opposite side surfaces in the width direction but also at the lower surface thereof and thereby prevented from rotating about the respective axes.

Brief Description of Drawings

[FIG. 1] FIG. 1 is an exploded perspective view of a female connector according to an embodiment viewed from the front thereof.
[FIG. 2] FIG. 2 is an exploded perspective view of the female connector according to the embodiment viewed from the rear thereof.
[FIG. 3] FIG. 3 is a front view of the female connector according to the embodiment.
[FIG. 4] FIG. 4 is a cross-sectional view of the female connector taken along the line indicated by the arrows 4 in FIG. 3.
[FIG. 5] FIG. 5 is a cross-sectional view of the female connector taken along the line indicated by the arrows 5 in FIG. 4.
[FIG. 6] FIG. 6 is a side view of the connector according to the embodiment.
[FIG. 7] FIG. 7 is a cross-sectional view of the connector taken along the line indicated by the arrows 7 in FIG. 6.
[FIG. 8] FIG. 8 is a front view of the female connector according to the embodiment and a male connector mated with each other.
[FIG. 9] FIG. 9 is a cross-sectional view of the connectors taken along the line indicated by the arrows 9 in FIG. 8.
[FIG. 10] FIG. 10 is a partial cross-sectional view of a conventional female connector.
[FIG. 11] FIG. 11 is a cross-sectional view of the female connector taken along the line indicated by the arrows 11 in FIG. 10.

Description of Embodiments

In the following, an embodiment of the present invention will be described with reference to FIGS. 1 to 9.
This embodiment relates to a connector used for an air bag for an automobile.
A female connector 10 according to this embodiment comprises a connector main body 20 and a housing 40 that houses the connector main body 20. The female connector 10 is to be mated with a male connector 60 described later.
A female terminal (a signal transmission terminal) 11 of the female connector 10 is connected to an apparatus side of an air bag unit, and a male terminal 63 of the male connector 60 is connected to a signaling side, such as a shock sensor.
The connector main body 20 has a sub-housing 21 in which a plurality of terminal accommodating cavities 22 (referred to as cavities 22 hereinafter) for accommodating a plurality of female terminals 11 therein are formed. The sub-housing 21 is integrally molded from a resin material by injection molding. The cavities 22 are formed to penetrate the sub-housing 21 in the front-back direction of the sub-housing 21. Male terminal inlets 32 are formed in a front end part of the sub-housing 21 at positions corresponding to the positions of the cavities 22. The sub-housing 21 further has elastically deformable lances 23 facing the cavities 22. The female terminal 11 is primarily locked by the lance 23. The female terminal 11 is secondarily locked when the connector main body 20 is fitted into the housing 40.
The female terminal 11 is formed by stamping and bending a metal material that has both high strength and high conductivity. The female terminal 11 has a contact piece 11a formed by folding back a front end part thereof and a contact protrusion 11b protruding to the inside of the cavity 22. The male terminal 63 of the male connector 60 is electrically connected to the female terminal 11 at the upper surface in contact with the contact piece 11a and the lower surface in contact with the contact protrusion 11b. In FIG. 4, illustration of the female terminals 11 accommodated in the cavities 22 in the lower two rows is omitted.
Adjacent two of the female terminals 11 accommodated in the cavities 22 in the uppermost row are paired. In this embodiment, there are eight cavities 22 in the uppermost row, and thus, there are four pairs of female terminals 11 in total. In a state where the female connector 10 is separated from the male connector 60, the paired female terminals 11 are short-circuited, thereby preventing an accidental current flow to the air bag side. In a state where the female connector 10 and the male connector 60 are mated with each other, the short circuit between the paired female terminals 11 is broken.
Short-circuit terminal accommodating cavities 24 (referred to as cavities 24 hereinafter) for accommodating the U-shaped short-circuit terminals 12 therein are formed in a front part of the sub-housing 21. In the drawings, the cavities 24 are formed below the cavities 22 in the uppermost row. Four cavities 24 are arranged in the width direction of the sub-housing 21, with each cavity 24 associated with two cavities 22. The sub-housing 21 has a window 25 that is formed to the rear of the lance 23 and through which the cavities 22 in the uppermost row and the cavities 24 communicate with each other.
The sub-housing 21 has a retainer insertion hole 26 formed to the rear of the cavities 24. The retainer insertion hole 26 is formed in the width direction of the sub-housing 21 perpendicular to the front-rear direction of the sub-housing 21. The retainer insertion hole 26 communicates with the cavities 22 in the rows above and below the cavities 24. A retainer part 43 formed on the housing 40 is inserted into the retainer insertion hole 26. When the retainer part 43 is inserted to a proper position in the retainer insertion hole 26, the female terminals 11 are secondarily locked by the retainer part 43.
The sub-housing 21 has a guide groove 27 formed in the upper surface and guide grooves 28 and 29 formed in the lower surface. The guide grooves 27, 28 and 29 are formed in the width direction of the sub-housing 21.
The short-circuit terminal 12 is formed by stamping and bending a metal material that has both high strength and high conductivity. The short-circuit terminal 12 has a bottom plate part 13 to be fixed to the bottom surface of the cavity 24. The short-circuit terminal 12 further has a U-shaped bent part 14 formed by upwardly folding back a front end part of the bottom plate part 13 and a spring part 15 extending rearward from the bent part 14. The spring part 15 has a contact part 16 formed to protrude upward. In short, the short-circuit terminal 12 has the bent part 14 at the front thereof and the contact part 16 at the rear thereof.
A positioning hole 13a (see FIG. 5) is formed in the bottom plate part 13, and a positioning protrusion 31 formed on the bottom surface of the cavity 24 is fitted into the positioning hole 13a to fix the short-circuit terminal 12 to the sub-housing 21.
The spring part 15 branches into two sections. Therefore, one short-circuit terminal 12 has two contact parts 16. In the state where the female connector 10 is separated from the male connector 60, the two contact parts 16 are in contact with the lower surfaces of the paired two female terminals 11 through the window 25. As a result, the paired two female terminals 11 are short-circuited. In the state where the female connector 10 is mated with the male connector 60, a short-circuit breaking protrusion 62 formed on the male connector 60 is inserted between the lower surface of the female terminal 11 and the contact parts 16 to press the contact parts 16 down, thereby breaking the short-circuit state (see FIG. 9).
The housing 40 has a connector receiving cavity 41 (referred to as a cavity 41 hereinafter) for receiving the connector main body 20 therein. The housing 40 is also integrally molded from a resin material by injection molding.
The cavity 41 has an opening on one side in the width direction of the housing 40, and the connector main body 20 is inserted into the cavity 41 through the opening. The housing 40 has a plurality of male terminal inlets 42 formed in the front end surface thereof at positions corresponding to the male terminal inlets 32 of the connector main body 20. The male terminals 63 of the male connector 60 are connected to the female terminals 11 through the male terminal inlets 42 and the male terminal inlets 32.
The retainer part 43 to be inserted into the retainer insertion hole 26 of the connector main body 20 is formed in the cavity 41 of the housing 40. The retainer part 43 protrudes from the inner surface of a side wall 44 of the housing 40 opposite to the side where the opening is formed. When the connector main body 20 is fitted into the housing 40, an engaging end 11c of the female terminal 11 abuts against the front end surface of the retainer part 43, and thereby the female terminal 11 is secondarily locked.
The housing 40 has guide protrusions 47, 48 and 49 protruding into the cavity 41. When the connector main body 20 is inserted into the cavity 41 of the housing 40, the guide protrusion 47 is inserted into the guide groove 27, the guide protrusion 48 is inserted into the guide groove 28, and the guide protrusion 49 is inserted into the guide groove 29, thereby guiding the connector main body 20 to a predetermined position in the cavity 41.
The housing 40 has a lock arm 45 formed to the rear of the retainer part 43 in the cavity 41 (see FIG. 7). The lock arm 45 protrudes from the inner surface of the side wall 44 of the housing 40. The lock arm 45 has an engaging protrusion 46 protruding upward formed at the tip end thereof, and the engaging protrusion 46 is engaged with an engaging groove 30 formed in the sub-housing 21 to prevent the connector main body 20 from falling off the housing 40.
For the female connector 10, the short-circuit terminals 12 are inserted into the cavities 24 of the sub-housing 21 from the front. When the female terminals 11 are inserted into the cavities 22 of the sub-housing 21 from the rear, the female terminals 11 are primarily locked by the flexible lances 23. The paired female terminals 11 come into contact with the contact parts 16 of the short-circuit terminals 12 and are thereby short-circuited. Although the cavities 22 located above the cavities 24 have been described above, the female terminals 11 accommodated in the cavities 22 below the cavities 24 are also primarily locked by the lances 23.
The connector main body 20 provided with the female terminals 11 and the short-circuit terminals 12 is inserted into the cavity 41 through the opening of the housing 40. In this operation, the retainer part 43 is inserted into the retainer insertion hole 26 of the connector main body 20. When the connector main body 20 is inserted to a proper position, the engaging protrusion 46 formed at the tip end of the lock arm 45 is engaged with the engaging groove 30 of the sub-housing 21 to prevent the connector main body 20 from falling off the sub-housing 21. In addition, the engaging ends 11c of the female terminals 11 abut against the front end surface of the retainer part 43, and thereby the female terminals 11, which have been primarily locked by the lances 23, are secondarily locked.
When the female connector 10 thus configured is mated with the male connector 60, the male terminals 63 held in the housing 61 of the male connector 60 and the female terminals 11 held in the connector main body 20 of the female connector 10 are electrically connected to each other. In this mated state, the short-circuit breaking protrusions 62 formed on the housing 61 of the male connector 60 are inserted between the contact parts 16 of the short-circuit terminals 12 and the female terminals 11 to press the contact parts 16 down, thereby breaking the short-circuit state of the paired female terminals 11 (see FIG. 9).
Characteristics of the female connector 10 according to this embodiment described above will be described in comparison with the conventional female connector 100.

(1) For the conventional female connector 100, the elastically deformable lance 112 cannot adequately absorb the upward force applied to the female terminal 120. Thus, the female terminal 120 is likely to be deformed to be bent upward. As a result, the contact between the short-circuit terminal and the female terminal 120 is unstable.
To the contrary, as shown in FIG. 4, for the female connector 10 according to this embodiment, the bent part 14 of the short-circuit terminal 12 is located forward, and the contact parts 16 of the short-circuit terminal 12 are located to the rear of the lance 23. An upper supporting wall 21a that defines the cavity 22 is formed above the contact parts 16. The upper supporting wall 21a is more rigid than the lance 23, and therefore, the female terminal 11 is less likely to be deformed upward even if an upward force is applied to the female terminal 11 by the short-circuit terminal 12, for example. Therefore, the contact between the female terminal 11 and the short-circuit terminal 12 is stable. As a result, the short circuit between the paired female terminals 11 can be stably maintained.
(2) For the conventional female connector 100, the contact part of the short-circuit terminal is in contact with the lower surface of the contact protrusion 120b of the female terminal 120. As shown in FIG. 11, the lower surface of the contact protrusion 120b is inclined at the opposite sides. If the contact protrusion 120b is in contact with the short-circuit terminal at the inclined surface, the contact area is insufficient, and the electrical connection between the short-circuit terminal and the female terminal 120 is also insufficient.
To the contrary, for the female connector 10 according to this embodiment, the contact parts 16 are disposed to the rear of the lance 23. Since the contact protrusion 11b is displaced from the position corresponding to the contact parts 16, the lower surface of the bottom plate part 13 is flat at that position. Therefore, the female connector 10 according to this embodiment has a sufficient contact area between the contact parts 16 and the female terminals 11, and therefore, the short circuit between the paired female terminals 11 can be stably maintained.
(3) For the conventional female connector 100, as shown in FIG. 11, the window 114 is formed in the front end of the housing 110. As a result, the female terminal 120 is inadequately held at the front end, so that the female terminal 120 may rotate about the axis thereof and be displaced from the proper position. As the displacement becomes significant, the female terminals 120 become unable to be smoothly mated with the male terminals.
To the contrary, for the female connector 10 according to this embodiment, there is a lower supporting wall 21b that supports the lower surface of the female terminal 11 at the front end of the sub-housing 21 (see FIG. 5). Therefore, at the front end of the sub-housing 21, the female terminal 11 is held not only at the opposite side surfaces in the width direction but also at the lower surface, so that the female terminal 11 is less likely to rotate about the axis thereof and is not significantly displaced. Thus, the female terminals 11 can be smoothly connected to the male terminals 63.
(4) For the conventional female connector 100, in fabrication of the housing 110 by injection molding, a molding pin P for forming the window 114 is inserted from the front (see FIG. 10). If the molding pin P is placed below the male terminal inlet 113 during injection molding, the thickness and strength of a lower wall 113a decreases accordingly. As the thickness of the wall 113a decreases, the length of an inclined surface T formed at the front end of the lower wall 113a decreases. As a result, the area for receiving the male terminal 63 decreases, and the possibility of failing to guide the male terminal 63 into the male terminal inlet 113 increases. If the female connector 10 and the male connector 60 are forcedly mated with each other when the tip ends of the male terminals 63 abut against the inclined surfaces T, the male terminals 63 may damage the wall 113a.
To the contrary, for the female connector 10 according to this embodiment, the retainer insertion hole 26 extending in the width direction is formed in the sub-housing 21 of the connector main body 20 (see FIG. 4). To form the retainer insertion hole 26 during the injection molding, a molding pin to form the retainer insertion hole 26 is inserted in the width direction. If the molding pin has a shape corresponding not only to the retainer insertion hole 26 but also to the window 25, the window 25 can be formed without the molding pin inserted from the front. In this case, unlike the conventional female connector 100, the thickness of a lower wall 32a of the male terminal inlet 32 does not decrease. As a result, compared with the conventional connector 100, the area for receiving the male terminal 63 increases, and the possibility that the male terminals 63 abut against and damage the wall 32a decreases.

Although an embodiment of the present invention has been described above, the present invention should not be construed as being limited to the embodiment. Although the embodiment described above relates to a connector used for an air bag, the present invention can be widely applied to a connector provided with signal transmission terminals to be short-circuited and a short-circuit terminal. The female terminals 11 to be short-circuited are not limited to those in the uppermost row in the sub-housing 21, and the female terminals 11 disposed in the lowermost row can also be short-circuited.

Reference Signs List

10 ...: female connector,
11 ...: female terminal, 11a ... contact piece, 11b ... contact protrusion, 11c ... engaging end,
12 ...: short-circuit terminal,
13 ...: bottom plate part,
14 ...: bent part,
15 ...: spring part,
16 ...: contact part,
20 ...: connector main body,
21 ...: sub-housing, 21a ... upper supporting wall, 21b ... lower supporting wall,
22 ...: terminal accommodating cavity (cavity),
23 ...: lance,
24 ...: short-circuit terminal accommodating cavity (cavity),
25 ...: window,
26 ...: retainer insertion hole,
32 ...: male terminal inlet, 32a ... wall,
40 ...: housing,
41 ...: connector receiving cavity (cavity),
42 ...: male terminal inlet,
43 ...: retainer part,
44 ...: side wall,
45 ...: lock arm,
60 ...: male connector,
61 ...: housing,
62 ...: short-circuit braking protrusion,
63 ...: male terminal

Claims

An electrical connector, comprising:
a housing that has a plurality of terminal accommodating cavities provided with flexible lances by which signal transmission terminals are locked and a short-circuit terminal accommodating cavity adjacent to the terminal accommodating cavities;

signal transmission terminals accommodated in the terminal accommodating cavities; and

an U-shaped short-circuit terminal accommodated in the short-circuit terminal accommodating cavity,

wherein the short-circuit terminal has a bent part at a forward position in a direction of mating with a mating electrical connector and a contact part at a rearward position in the direction of mating,

the housing has a window that is formed at a position to the rear of the lances corresponding to the contact part of the short-circuit terminal and through which the terminal accommodating cavities and the short-circuit terminal accommodating cavity communicate with each other and an upper supporting wall for the signal transmission terminals formed at a position to the rear of the lances corresponding to the contact part of the short-circuit terminal, and

the contact part of the short-circuit terminal is in contact with the signal transmission terminals through the window.
The electrical connector according to Claim 1, further comprising:
a secondary locking member that locks the signal transmission terminals in addition to the lances serving as a primary locking member,

wherein the secondary locking member is inserted into the housing in a width direction of the housing, and

the secondary locking member locks the signal transmission terminals at a position to the rear of the short-circuit terminal.
The electrical connector according to Claim 1,
wherein the housing has a lower supporting wall that supports the signal transmission terminals at a front end of the terminal accommodating cavities.
The electrical connector according to Claim 1,
wherein the upper supporting wall has a higher rigidity than the lances.
The electrical connector according to Claim 1,
wherein the short-circuit terminal has a spring part that extends rearward from the bent part, and the spring part branches into two sections.